Take-up mechanism for looms



s v R A J A TAKE-UP MECHANISM FOR LOOMS 3 Sheets-Sheet 1 Filed Aug. 17, 1.950

JNVENTOR.

- ADOLFHUS JARVIS.

BY 4 3% M A 7' form/145.

ec. 23, 1952 A. JARVIS 2,622,632

TAKE-UP MECHANISM FOR LOOMS Filed Aug. 17, 1950 5 Sheets-Sheet 2 BY W /| TTORIVEVJ.

w 1952 A. JARVIS TAKE-UP MECHANISM FOR LOOMS 3 Sheets-Sheet 3 Filed Aug. 17, 1950 INVENTOR. ADo|. PH us JARVIS.

Patented Dec. 23, 1952 TAKE-UP MECHANISM FOR LOOMS Adolphus Jarvis, Grosvenor-Dale, Conn, assignor to Grosvenor-Dale Company, Inc., Grosvenor- Dale, Conn, a corporation of Delaware Application August 17, 1950, Serial No. 179,918

11 Claims.

This invention relates to looms and particularly to looms for weaving fabrics having a less density of both warp and filling in certain sections to give a cloth having shadow effects or other effects, as desired.

It has heretofore been known to weave barred dimity and other barred stripes or checked effects. These effects have been provided usually by stopping the loom at certain predetermined intervals and forming stripes by bunching a mass of filling picks or threads, causing them to compact and make a rib effect in the cloth. The barred effects have been made by a similar procedure, crossing the ribs with bunches of warp threads provided in a wellknown manner. In other cases, the take-up roll has been speeded up to make a thin portion of the fabric consisting only of warp threads and, upon completion of this portion, the normal weaving operation proceeds.

The principal object of my invention is to provide a simple and efficient device which may be built in as part of a loom or may be attached to a loom for manufacturing the above-mentioned type of cloth.

Other objects and features of the invention will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the novel apparatus and combinations thereof, specific embodiments of which are described herein by way of example only and in accordance with the manner in which I now prefer to practice the invention.

In my copending application Serial No. 144,673. filed February 17, 1950, and entitled Looms, I have described a loom whose operation differs from the operation of the looms of the prior art and which produces a different type of cloth from that produced by such prior art machines. The aforesaid application describes a dobby loom combined with a mechanism controlled by a dobby chain to operate a sand roll at an accelerated speed along with the usual means to operate the shuttle and other parts of the loom substantially without change of the speed and timing thereof. The mechanism operates to produce various check and other effects, including fabric portions which are of varying densities, and the mechanism includes a pair of ratchet gears arranged to be operated alternateother gear is arranged to speed up the rotation v of the sand roll.

In accordance with the invention of this application, I provide an improved mechanism for controlling the rotational speed of a sand roll in a dobby loom. Due to its construction and method of operation, the mechanism of this invention requires only a single dobby jack and strap for controlling the speed of the sand roll, and the sand roll is driven continuously at two different rates rather than intermittently at two different rates as with the mechanism of the above-mentioned copending application.

In one form of the invention the control mechanism comprises a pair of gears which are driven continuously but which are driven at low and high speeds respectively. A shaft which carries a gear forming part of the sand roll driving gear train also carries a clutch gear which is keyed thereto but which is movable axially with respect to the shaft. In one position on the shaft, the clutch gear meshes with the gear driven at a low speed, thus driving the sand roll at a low or normal speed, and in another position on the shaft, the clutch gear meshes with the gear driven at a high speed, thus driving the sand roll at a rate higher than normal. The position of the clutch gear is determined by the operation of a dobby jack associated with a dobby chain whose operation is timed with respect to the movements of the remainder of the loom apparatus. The other parts of the loom continue to operate at substantially normal speed irrespective of the engagement of the clutch gear and hence irrespective of the speed of the sand roll.

The invention may be better understood by reference to the following detailed description of a specific embodiment of the invention in connection with the accompanying drawings in which:

Fig. l is aside elevation view of a portion of a loom incorporating the apparatus of my invention;

Fig. 2 is an end elevation view of the portion of the loom shown in Fig. 1;

Fig. 3 is an enlarged perspective view of the speed changing mechanism which forms a part of my invention;

Fig. 4 is a cross section of the speed changing mechanism shown in Fig. 3 taken along the line 4-4 indicated in Fig. 3; and

Fig. 5 is a cross section of the speed changing mechanism taken along the line 5-5 indicated in Fig. 4.

Referring to Figs. 1 and 2, there is shown a dobby loom including the novel speed changing mechanism which forms part of my invention.

The loom comprises a frame base member and upright frame members 2, 3, 4, 5, 6 and Warp threads 8 are fed from a warp beam 9 supported from the member 2 through the main upright member 6, around rollers I and II and around a sand roll l2 and the threads terminate on a cloth roll I3. A lay cap I4 is mounted on a lay beam |5 which is reciprocally driven by a pitman l6 attached at one end to a crank arm IT. The crank arm I! is driven by a gear wheel I8 which in turn is driven from a main shaft I9.

A shuttle 88 is passed back and forth between the shed formed by the upper and lower warp threads 8. Associated with the shuttle 88 is a conventional picker stick 23 whose operation is controlled by a shaft 2| associated with a cam. 22 mounted on the main shaft IS.

The sand roll I2 is rotated by a gear train comprising gears 23, 24, 25, 26, 21 and 28. The gear 28 is driven by a worm gear 29 mounted on the end of a shaft 39. The shaft 38 is driven by a clutch gear 3| which engages with either of two gears 32 and 33, the gear 32 being driven by a shaft 34 and the gear 33 being driven by an idler gear 35 meshed therewith and an idler gear 36 meshed with the gear 32. A beveled gear 31 mounted on the main shaft l9 meshes with a second beveled gear 38 mounted on the shaft 34 and hence causes the shaft 34 to rotate with the main shaft i9.

The loom further comprises a dobby chain control mechanism which is operated by a connecting rod 39 eccentrically mounted on the main shaft is. The dobby control mechanism comprises a dobby chain 49 havin the usual pegs which operate indexers 4|, which indexers in turn control the operation of dobby jacks 42. The dobby chain 40 passes over a dobby cylinder 43. One of the jacks designated by numeral 44 has a jack extension 45 thereon which is connected to a strap 46. At its other end, the strap 46 is connected by means of a link 47 to an arm 48 which controls the operation of th clutch gear 3|. The operation of the jack 44 is controlled by pegs as at 49 on the dobby chain which pegs connect with pivotally mounted indexers 50 and 5! to operate the indexers at the proper time so as to cause their ends to raise or lower in a well known manner.

As shown in Fig. 2, the right ends of the indexers 5i: and 5| have been raised so as to release both hooks 52 and 53. The right ends of the indexers have been raised because at the particular stage of operation illustrated, there are no dobby pegs on the dobby chain to strike the left ends of the indexers and in the absence of dobby pegs, the left ends of the indexers 5B and 5: are lowered so that the lower edges thereof rest on slats 59 of the dobby chain. When the hooks 52 and 53 are released, as shown in Fig. 2, a hook lever 54 is also released so that the jack 44 pivots about a pin 55, thus lowering the jack extension '55 and permittin lowering of the strap 46.

Whenever dobby pegs 49 engage the left ends of the indexers 56 and 5|, the right ends of the indexers are lowered. Lowering of the right ends of the indexers permits the hooks 52 and 53 to engage griif bars 56 and 57 which are driven by a rocker arm 58. The rocker arm 58 is driven by the connecting rod 39 and when the hooks 52 and 53 are engaged with the griff bars 56 and 51, the jack 44 is moved forward to an upright position. Movement of the jack 4-: to an upright position raises the jack extension 45 and, therefore, pulls the strap 45. The effect of pulling the strap 66 will be further described in connection with the description of Figs. 3, 4 and 5.

Timing of the dobby chain and the distribution of the pegs thereon are so arranged with respect to the timing and operation of the shuttle that the jack 44 moves from the position shown in Fig. 2 to an upright position between passes of the shuttle from one end of the shed to the other. In other words, the jack M is moved from the position shown in Fig. 2 to an upright position after the shuttle completes a pass through the shed and before it makes the next pass through the shed.

The mechanism for driving the sand roll gear train is shown in greater detail in Figs. 3, 4 and 5 and it comprises the shafts 39 and 34 which are journaled in bearings 6| El and 62. The shaft 34 carries at one end the beveled gear 38 which meshes with the beveled gear 3i mounted on the main driving shaft Hi. The other end of the shaft 34 carries the gear 32 having in addition to circumferential gear teeth, a serrated face 63. Longitudinal motion of the shaft 34 is prevented not only by the gear 32 which is pinned to the shaft 34 but also by a collar as which is fastened to the shaft 34 on the opposite side of the bearing 62.

The gear 32 drives the pair of idler gears 33 and 35 which are mounted on opposite ends of an idler shaft which is journaled in a bearing 55. The idler gear 35 meshes with th gear 33 mounted on the shaft 39 and rotatable with respect thereto. The gear 33 also has a serrated face iii which in Fig. 3 is shown engaged with one of the two serrated faces of the clutch gear 3|. The other serrated face of the clutch gear 3| is engageable with the serrated face 63 of the gear 32. The clutch gear 3| is mounted on the shaft 30 and although the gear 3| is keyed to the shaft 39, it is slidable in a longitudinal direction with respect to the shaft 38. The position of the clutch gear 3i on the shaft 36 is determined by the position of a fork 68 which is mounted on a shaft 69 and is fastened thereto such as by a set screw i9. The shaft 69 is journaled in a bearing H and is held in position by the arm 48, which is held thereon as by set screw 15 and by a collar l4 pinned to the shaft. The arm 48 is normally pulled in a downward direction by a spring 12 which is secured at one end to the frame of the loom and which is secured at its opposite end in the aperture (3 in the arm The strap 45 is also connected to the arm 68 by means of the link s? which passes through the aperture 73 in the arm 8 and an aperture in the end of the strap 46.

As shown in Fig. 4, the gear 32 is held on the shaft 34 by a pin 18 which passes through both the hub of the gear 32 and the shaft 34. The end of the shaft 34 is hollow and adapted to receive an end 17 of the shaft 36 which end has a reduced diameter. Rotary motion of the clutch gear 3| is imparted to the shaft 30 by means of a pair of keys 18 and 79 which are mounted in keyways on the shaft 30. The interior bore of the gear 3| has a pair of key slots extending axially of the gear for receiving the keys 78 and F9 which slots permit the clutch gear 3| to move axially of the shaft 30 and thus to be moved from engagement with serrated face El to engagement with serrated face 63.

The gear 33, as mentioned previously, is rotatable with respect to the shaft 3!] and, therefore, is not pinned or otherwise fastened to the shaft 33.

However, the gear 33 is prevented from movin axially along the shaft 30 in one direction by a shoulder 80 and in the other direction by a collar 8| secured to the shaft 30 as by a pin 82.

The gears 35 and 36 are held on the idler shaft 65 by means of keys '83 and 84. Thus, rotation of one of the gears causes rotation of the idler shaft 65 and hence rotation of the other of the gears mounted on the shaft. In normal operation, the gear 32 is continuously rotated by the shaft 34 which causes both idler gears 35 and 36 to rotate and idler gear 35 in turn causes continuous rotation of the gear 33. Because of the relative diameters of the gears 32, 33, 35 and 36, the gear 33 rotates at a speed slower than the rotational speed of the gear 32. It will be clear from the example of operation given hereinafter that the relative diameters of the gears are so chosen that they produce the desired difference in density of the filling threads of the cloth being Woven. In one embodiment of the invention, the diameters were so chosen that the rotational speed of the gear 33 was twothirds of'the rotational speed of the gear 32.

By referring to Figs. 4 and 5, it will be seen that the gear 3| has an annular groove 85 and a pair of studs 86 and 8! mounted on the fork B8 engage the gear 3| within the annular groove 85 so that when the fork is rotated about the axis of the shaft 69 by the arm 48, the gear 3| is moved from engagement with the gear 33 to engagement with the gear 32. Therefore, when the gear 3| is engaged with the gear 33, the shaft 30 is rotated at a slow or normal speed whereas when the fork 68 is operated so that the gear 3| becomes engaged with the gear 32, the shaft 30 is rotated at a higher or accelerated speed. As previously mentioned, the shaft 30 which carries the worm gear 29 causes rotation of the gears in the gear train for driving the sand roll I2 and hence the rotational speed of the sand roll I2 is determined by the engagement of the clutch gear 3|.

The general operation of the loom is believed to be clear from the foregoing description. As an example of a specific method of operation of the loom, let it be assumed that a checked fabric of the type shown in my above-mentioned copending application is to be woven. Under these circumstances, the warp threads 8 are arranged to be fed from the warp beam 9 in a well known manner so that there are alternate equal sections of lesser and greater density. The pegs on the dobby chain 40 are then arranged so that the jack 44 will assume alternately the position shown in Fig. 2 and an upright position for periods of time which are determined by the size of the checks desired and the gear ratios in the speed changing mechanism. Also, the dobby chain and the pegs thereon are so timed with respect to the passing of the shuttle that the jack 44 changes from one position to the other between passes of the shuttle. If it is assumed that it is first desired to weave a transverse strip of the cloth having a greater density of filling threads, then the pegs would be so arrangedon the dobby chain that the jack 44 first assumes the position shown in Fig. 2. In this position of the jack 44, the strap 46 is lowered and the gear 3| is engaged with gear 33. Thus, the sand roll is driven at a slow or normal speed. When the loom is started, the entire loom is operated at normal speed and hence the filling threads will be interwoven with the warp threads with a density which is determined by the relative rates same or different widths.

6 of movement of the warp threads and the shuttle.

. After a predetermined number of passes of the shuttle, the jack 44 will move forward to an upright position pulling the strap 46 upward and changing the gear 3| from engagement with gear 33 to engagement with gear 32. The sand roll l2 will then increase its rotational speed but the other parts of the loom, including the shuttle, will continue to operate at substantially the speed at which they operated prior to the change of the sand roll speed. In this manner, the rate of longitudinal movement of the warp threads is increased so that for a given length of the warp thread, a fewer number of filling threads are interwoven with the warp threads than when the sand roll 12 was driven at the slower or normal speed. When a length of the warp thread equal to the length of the warp thread interwoven with the filling threads during the time'the sand roll l2 was operated at the slow speed has passed by the shuttle, the jack 44 reassumes the position shown in Fig. 2 and the gear 3| disengages from gear 32 and again becomes engaged with gear 33. The steps just described are then repeated so that a length of cloth having equal squares of greater and lesser density of filling and warp threads is obtained.

Other modes of operation of the loom of my invention will be obvious to those skilled in the art from the description of the operation of the loom given above. The loom may, for example, be used to produce cloth having checks of different sizes or having only transverse stripes of the Also, it will be noted that although in the preferred embodiment described, the rate of operation of the sand roll with respect to the rate of operation of the shuttle and other parts of the loom is changed by maintaining the rate of operation of the latter constant and by changing the rate of operation of the sand roll, the relative rates may be changed even though the rate of operation of the shuttle and other parts of the loom is also changed when While I have described my improvements in great detail and with respect to preferred forms thereof, I do not desire to be limited to such details and forms since many changes and modifications may be made and the invention embodied in widely different forms without departing from the spirit and scope thereof in its broader aspects. Hence, I desire to cover all modifications, forms and embodiments coming within the language or scope of any one or more of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a loom, a combination of a sand roll, a shuttle, a dobby chain, first means for continuously driving said roll at a first speed, second means for continuously driving said roll at an accelerated speed, means controlled by said chain for alternately connecting said first and second means to said sand roll and means for operating said shuttle and other parts of said loom at the same speed and timing during the driving of said roll at said first and accelerated speeds.

2. In a loom, a combination of a sand roll, a shuttle, a dobby chain, a pair of rotatable members arranged to be driven at different speeds, means for driving said sand roll, means under control of said dobby chain for selectively engaging said driving means with said rotatable members, and means for operating said shuttle and other parts of said loom at substantially the same speed and timing when said driving means is engaged with said members.

3. In a loom, a combination of a sand roll, a pair of members arranged to be rotated continuously at different speeds, means for driving said roll comprising a clutch member selectively engageable with said pair of members, means for controlling the engagement of said clutch member comprising a dobby chain, a shuttle and means for operating said shuttle and other parts of the loom at substantially the same speed and timing during the engagement of said clutch member with said pair of members.

4. In a loom, a combination of a sand roll, a shuttle, a dobby chain, a pair of members arranged to be rotated at different speeds, means for driving said roll comprising a clutch member selectively engageable with said pair of members, means under control of said dobby chain for alternately engaging said clutch member with one and then the other of said pair of members and means for operating said shuttle and other parts of said loom at substantially the same speed and timing when said clutch member is engaged with said pair of members.

5. In a loom, a combination of a sand roll, a shuttle, a dobby chain, a pair of members arranged to be rotated at different speeds, means for driving said roll comprising a clutch member selectively engageable with said pair of members, means for passing said shuttle, and means for alternately engaging said clutch member with one and then the other of said pair of members comprising means under control of said dobby chain for operating said clutch member in timed relation with respect to the passing of said shuttle.

6. In a loom, a combination of a sand roll, a shuttle, a dobby chain, a pair of members arranged to be rotated at different speeds, means for driving said roll comprising a clutch member selectively engageable with said pair of members, means for passing said shuttle, and means for alternately engaging said clutch member with one and then the other of said pair of members comprising means under control of said dobby chain for changing said clutch member from engagement with one of said pair of members to engagement with the other of said pair of members between one pass and the next pass of said shuttle.

7. In a loom, a combination of a sand roll, a shuttle, a dobby chain, means for passing said shuttle, a first rotatable member, means for driving said member in synchronism with the passing of said shuttle, a second rotatable member, means for driving said second member at a speed greater than the speed of said first member, means for driving said sand roll and means under control of said dobby chain for selectively connecting said driving means to said first member and to said second member.

8. In a loom, a combination of a sand roll, means for driving said sand roll comprising a pair of rotatable members arranged to be driven at different speeds and a. clutch member connected with said sand roll and selectively engageable with said pair of members; means for controlling the engagement of said clutch member comprising a dobby chain, a dobby jack arranged to be operated by said chain and means for connecting said jack to said driving means; a shuttle and means for passing said shuttle at substantially the same speed and timing during the engagement of said clutch with one and then the other of said pair of members.

9. In a loom, a combination of a sand roll, means for driving said sand roll at two different speeds comprising a pair of rotatable members having surfaces arranged to be driven at different speeds and a clutch member connected with said sand roll for rotating said roll and having a surface selectively engageable with said surfaces of said pair of members; means for controlling the engagement of said clutch member surface with said surfaces of said pair of members comprising a dobby chain, a dobby jack arranged to be operated by said chain and means for connecting said jack to said clutch member; a shuttle and means for passing said shuttle at substantially the same speed and timing during the engagement of said clutch surface with the surface of one of said pair of members and during the engagement of said clutch surface with the surface of the other of said pair of members.

10. In a loom, a combination of a sand roll, means for driving said sand roll at two diiferent speeds comprising a pair of rotatable gears having serrated faces and arranged to be driven at different speeds and a clutch member arranged to drive said sand roll and having a pair of serrated faces, each of said pair of serrated faces being selectively engageable with a serrated face of one of said pair of members; means for controlling the engagement of the face of said clutch member with the faces of said pair of members comprising a dobby chain, means for driving said dobby chain, a dobby jack arranged to be operated by said chain, means for moving said clutch member, and means for connecting said jack to said moving means; a shuttle and means synchronized with said dobby chain driving means for passing said shuttle at substantially the same speed and timing during the engagement of one face of said clutch member with the face of one of said pair of members and during the engagement of the other face of said clutch member with the face of the other of said pair of members.

11. In a loom, a combination of a sand roll, a gear train for rotating said sand roll, means for driving said gear train at two different speeds comprising a first rotatable shaft having a gear on one portion thereof engaged with a gear of said gear train and having on another portion thereof a first gear having a serrated face and a clutch gear rotatably fixed to said shaft and having a pair of serrated faces, said first gear being rotatably mounted on said shaft and one of said serrated faces of said clutch gear being engageable with the serrated face of said first gear, a second shaft coaxial with said first shaft and having on one portion thereof a second gear having a serrated face engageable with the other serrated face of said clutch gear, a pair of interconnected idler gears, one of said idler gears being meshed with said second gear and the other of said idler gears being meshed with said first gear and means for driving said second shaft; means for controlling the engagement of said serrated face of said clutch gear with the serrated faces of said first and said second gears comprising a dobby chain having pegs thereon, means for driving said dobby chain in synchronism with said means for driving said second shaft, a dobby jack engageable with said dobby pegs and arranged to be operated thereby, means for moving said clutch gear axially along said first shaft and a strap for interconnecting said moving means and said jack; a shuttle and means synchronized with said dobby chain driving means and said second shaft driving means for passing said shuttle at substantially the same speed and timing during the engagement of one face of said clutch gear with the face of said first gear and during the engagement of the other face of said clutch gear With the face of said second gear.

ADOLPI-IUS JARVIS.

10 REFERENCES orran The following references are of record in the file of this patent:

UNITED STATES PATENTS 

